单项选择题
The very ubiquity of electronic communications can have a surprising downside, notes Richard Kohn, a military historian at the University of North Carolina: a wire becomes accustomed to frequent email from her husband, until he can’t get to a computer. And then her anxiety increases（）.
A．failure
B．underside
C．drawback
D．consequence
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No thing fuels cynicism for watching two titanic institutions squabble over their reputations（）.
A．No... as
B．Something... like
C．Nothing... like
D．No... than -
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Approximately how much of the Earth’s atmosphere is nitrogen（）
A．One-fourth
B．One-half
C．Three-fourths
D．All of it -
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A．is spending on
B．will be spent in
C．will be spent on
D．be spent on
